Revert of Revert of Revert of Make ninja display elapsed compile time by default.

Revert of Revert of Revert of Make ninja display elapsed compile time by default. (patchset #1 id:1 of https://codereview.chromium.org/483853002/)

Reason for revert:
see discussion in https://codereview.chromium.org/483853002/

Original issue's description:
> Revert of Revert of Make ninja display elapsed compile time by default. (patchset #1 of https://codereview.chromium.org/405733002/)
> 
> Reason for revert:
> see discussion in https://codereview.chromium.org/268833006/
> 
> Original issue's description:
> > Revert of Make ninja display elapsed compile time by default. (https://codereview.chromium.org/268833006/)
> > 
> > Reason for revert:
> > This made the build pages more noisy and happened to not be as useful as hoped in practice.
> > 
> > If someone wants to use this to debug something, please add it temporarily while you debug, and then remove it again when you're done.
> > 
> > Original issue's description:
> > > Make ninja display elapsed compile time by default.
> > > 
> > > This will help debug slow or hanging compiles.
> > > 
> > > BUG=none
> > > 
> > > Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=269042
> > 
> > r287547
> 
> TBR=thakis@chromium.org
> 
> 
> Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=290324

TBR=stip@chromium.org,phajdan.jr@chromium.org,thakis@chromium.org,jabdelmalek@google.com
NOTREECHECKS=true
NOTRY=true

[jam, 2014-11-17 17:19:32]

Created Revert of Revert of Revert of Make ninja display elapsed compile time by
default.

[commit-bot: I haz the power, 2014-11-17 17:20:02]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/734143002/1

[commit-bot: I haz the power, 2014-11-17 17:20:05]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2014-11-17 17:20:06]

Failed to apply patch for build/scripts/slave/compile.py:
While running patch -p1 --forward --force --no-backup-if-mismatch;
  patching file build/scripts/slave/compile.py
  Hunk #1 FAILED at 729.
  1 out of 1 hunk FAILED -- saving rejects to file
build/scripts/slave/compile.py.rej

Patch:       build/scripts/slave/compile.py
Index: scripts/slave/compile.py
diff --git build/scripts/slave/compile.py build/scripts/slave/compile.py
index
dc5d3b3e9791692fa6e595c5b957745e4f65c927..1331afa262fe0049077459578b7d4ad25acf7d37
100755
--- a/build/scripts/slave/compile.py
+++ b/build/scripts/slave/compile.py
@@ -729,7 +729,6 @@
 
   # Prepare environment.
   env = EchoDict(os.environ)
-  env.setdefault('NINJA_STATUS', '[%s/%t | %e] ')
   orig_compiler = options.compiler
   goma_ready = goma_setup(options, env)
   if not goma_ready:

[Nico, 2014-11-17 23:43:36]

I'm landing a rebased version of this at
https://codereview.chromium.org/730213003